Quasi-1D spin-1/2 Heisenberg magnets in their ordered phase: correlation functions
Fabian H. L. Essler, Alexei M. Tsvelik, Gesulado Delfino
Abstract
We study weakly coupled antiferromagnetic spin chains in their ordered phase by combinining an exact solution of the single-chain problem with an RPA analysis of the interchain interaction. A single chain is described by a quantum Sine-Gordon model and dynamical staggered susceptibilities are determined by employing the formfactor approach to quantum correlation functions. We consider both antiferromagnetic order encountered in quasi-1D materials like KCuF3 and spin-Peierls order as found in CuGeO3.
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